Controlling means for plunger pumps



March 3, 1931, s. BORLETTI CONTROLLING MEANS FOR PLUNGER PUMPS Filed May 6. 1929 *N MN Patented Mar. 1931 v SENATORE BORLE'ITI, or IIllILA IL ITALY CONTROLLING MEANS Application filed May 6,

tating body and particularly in the pumps formed by a cylindrical rotor longitudinally I i crossed by several cylindersand turning 1nto a casing in the ends of which are placed respectively twoinclined disc cams parallel to each other whiclrduring the operation of the rotor cause the reciprocating sliding movement of the pistons placed insidethe cylinders formed in the rotor itself to wit the cylinders of the pump. In these pumps the in clination of the disc cams controlling the movement of the pistons, may, as it .iswell known, be regulated by means of a suitable device, from the practical design and manoeuvring of which mainly depends the good working of the pump. v

The improvements forming the object of the present invention relate to the means for regulating the inclination of the disc cams controlling the pistons and consist in the fact that in order to'vary the. said inclination, action is had from'the outside only on one the other cam always follows the inclination of the driven cam, remaining parallel to the latter, caused by the action of a spring pushing it against the pistons of therotor cylinders.

Suitable mechanical means may be used to vary the inclination of the cam, for instance a shaft mounted in the rotor casing, parallel to the latter and provided with an enlarged threaded portion engaging a toothed segment v provided on the outer peripherical'surface of the cam.

This controlling system, compared with the other systems in whichboth the cams are operated presents the advantage that the difficulties met in operating both the control gears of the discs in exactly the same manner, also after a long use of the pump, are avoided.

with cylindrical turning body improved as above described.

r of the cams, the parts being so disposed that- The objectof the invention will be easily r ra es H a 1929. Serial no; 360341.

In the said: drawing j ,Fig. l is a longitudinal section of the pump; g Fig.2-is adetail of the cam. controlled by the controlling device; i Fig. 3 is a detail of the free cam and sub- JQCU-Jtl only to the action of a spring.

According to the drawing, '1 and 2 are two cylindrical rotor sections rigidly secured together in any suitable manner and formingathe' rotor of the pump; 4' is one of the cylinders-of the pump; 5 is the piston'pi'ovided with a' stem6; 7 isthe casing in which the rotor turns 8 and -9. are twoicovers for the casing conne ctcd to the latter by means of:screws 10- and ,11:; 12...istherotor shaft opera-ted by the toothed wheel ,13 fixed on the shaft by means of the nut--1l., screwed on the threaded end 15. of the shaft, the I other threaded end 16 of which is screwed .into the casing: --7 and the ring 17 which holds. the rotor in itspl'ace;

-18 is a fitting portion of the casing 7- carrying the tubular connections;l9 :and -QO of the pump; 21- is the controlled cap-like cam pivoted on the pivot 22 crossing the shaft 1'2, the cam being provided onqits peripherical surface with a toothed segment 23 24 is a replaceable disc placed into. the said cam; 25 is a bar sliding in an aligning. bore in rotor sections '1 and '2- and loosely connecting the recessed discs 24 and 30 with the rotor. This bar -25- like the piston '5 and stem -6 projects'beyo'nd the ends of the rope and is slightly longer than the combined lengths of the pistons and their stems. -26 is a shaft serving to regulate the inclination of cam. 2l, the saidshaft being screwed at 27 to the casing 7 and cover 9 V and provided with a threaded portion 28 which is engaged with the segment 28-; 29 is the adj usting head of the shaft 26-; 30 is the free cam or disc pushed against the pistons of the pump by the spring 81 arranged in a bush o32 sliding in the cover 9 and engaging with its spherical lug 38 a corresponding rccess 34r of disc So I 3 0; 37 is a set screw for controlling the position of the shaft.

It is obvious that the details of construction of the pump and the device controlling the inclination of the cams may be varied from those illustrated and described Without departing from the spirit of the invention.

Having; now particularly described and ascertained the nature of my invention and in What manner the same is to be performed, I declare that What I claim is: I y

l. A pump of the character described, including a casing, a rotor mounted therein and provided With longitudinally extending cylinders, a piston and its stem arranged in the cylinders projecting beyondthe ends of the rotor, recessed discs arranged at the respective ends of the c'asiugand contacting With the projecting end of the piston and its stem, a bar slidably mounted through the rotor and slightly longer in lengththan the combined lengths of the piston and its stem and loose- 1y connected at its ends-With the recesses in the discs, a cap-like cam surrounding one of the discs and mounted for oscillatory movement in the casing manually adjustable means operable from a point exteriorly of the casing for, regulating the inclination of the cam andconsequently the discs, and a yieldingly mounted thrust bearing arranged at the end of the casing opposite the cam and V universally engaged with the ad1ac'ent and l free disc for holding this disc in yielding contact with the ad]acent ends oi? the stem and barto ensure of the free disc being inclined simultaneously with and corresponding to the inclination of the first mentioned disc.

2. A pump as claimed in claim 1, wherein the end of the casing housing the bearing is provided With a recess and wherein the bearing includes a cap-like element, the outer end of which is formed With a cylindrical boss for-universal contact with, the free disc, and a spring enclosed Within the recess and the cap-like member and bearing against certain parts, sul'istantially asaud for the pur poses set forth.

In testimony Whereoi I atlix my signatm-e.

SENATORE BURLETTI. 

